Are the following data time series? If not, explain why.

a) Reports from the Bureau of Labor Statistics on the number of U.S. adults who are employed full-time in each major sector of the economy.

b) The quarterly Gross Domestic Product (GDP) of France from 1980 to the present.

c) The dates on which a particular employee was absent from work due to illness over the past two years.

d) The number of cases of flu reported by the CDC each week during a flu season.

Here is a table of values from the U.S. Bureau of Labor Statistics (disk file BLS_Output):

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Year Output/hr Labor Output/unit Capital 1987 64.1 96.4 1988 65.4 99.7 1989 66.1 99.1 1990 67.5 96.1 1991 69.3 92.2 1992 71.9 93.0 1993 73.8 94.3 1994 76.4 97.2 1995 79.8 98.7 1996 82.7 98.0 1997 87.3 100.6 1998 92.0 100.7 1999 96.1 100.4 2000 100.0 100.0 2001 101.6 93.5 2002 108.6 92.3 2003 115.3 93.2 2004 117.9 95.4 2005 123.5 98.9 2006 125.0 100.2